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CN1109964A - Process and installation for the distillation of air - Google Patents

Process and installation for the distillation of air Download PDF

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Publication number
CN1109964A
CN1109964A CN94118725A CN94118725A CN1109964A CN 1109964 A CN1109964 A CN 1109964A CN 94118725 A CN94118725 A CN 94118725A CN 94118725 A CN94118725 A CN 94118725A CN 1109964 A CN1109964 A CN 1109964A
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CN
China
Prior art keywords
air
regeneration
residual gas
gas
temperature
Prior art date
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Pending
Application number
CN94118725A
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Chinese (zh)
Inventor
P·阿尔犹劳
F·伯纳德
J·Y·莱曼
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LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Application filed by LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Publication of CN1109964A publication Critical patent/CN1109964A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04163—Hot end purification of the feed air
    • F25J3/04169—Hot end purification of the feed air by adsorption of the impurities
    • F25J3/04181—Regenerating the adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
    • F25J3/04018—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of main feed air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
    • F25J3/04024—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of purified feed air, so-called boosted air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/04193—Division of the main heat exchange line in consecutive sections having different functions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/10—Nitrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/12—Oxygen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/80—Water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/402—Further details for adsorption processes and devices using two beds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/20—Processes or apparatus using separation by rectification in an elevated pressure multiple column system wherein the lowest pressure column is at a pressure well above the minimum pressure needed to overcome pressure drop to reject the products to atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
    • F25J2205/34—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes as evaporative cooling tower to produce chilled water, e.g. evaporative water chiller [EWC]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/60—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end
    • F25J2205/66—Regenerating the adsorption vessel, e.g. kind of reactivation gas
    • F25J2205/70—Heating the adsorption vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/04—Compressor cooling arrangement, e.g. inter- or after-stage cooling or condensate removal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/42—Processes or apparatus involving steps for recycling of process streams the recycled stream being nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
    • F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
    • F28C2001/006—Systems comprising cooling towers, e.g. for recooling a cooling medium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S62/00—Refrigeration
    • Y10S62/902—Apparatus
    • Y10S62/908—Filter or absorber

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Separation Of Gases By Adsorption (AREA)
  • Gas Separation By Absorption (AREA)
  • Treating Waste Gases (AREA)

Abstract

To regenerate the adsorbent which serves to purify compressed air from water and carbon dioxide, there is used residual gas from an air distillation apparatus (10), heated to a substantially constant moderate regeneration temperature between the temperature of the air entering the mass of adsorbent and a temperature which is at most about 50 DEG C. higher, preferably about 10 DEG to 20 DEG C. higher, than this entering air temperature. This gas is then sent to a water refrigeration tower (16) for cooling the compressed air.

Description

Process and installation for the distillation of air
The present invention relates to the method for airdistillation, in the method: air is compressed; Air after this compression carries out heat exchange and is cooled by carrying out cooling water that heat exchange freezes in advance with residual gas from the airdistillation device; Compression and cooled air are removed wherein moisture and carbon dioxide by adsorbing in adsorbent; Make most of adsorbent reactivation by residual gas from the airdistillation device.
The device that adopts the airdistillation method to produce a large amount of oxygen and/or nitrogen generally includes the refrigeration tower, and this tower is used for the water that cooled compressed air is used is freezed, and can reduce its temperature so that compressed air enters adsorption chamber.Use residual gas (impure nitrogen or nitrogen-rich air) to supply with this refrigeration tower from distilling apparatus.
In usual way, only some residual gas is supplied with the refrigeration tower, and remainder only is used for reproducing adsorbent.Therefore, common regeneration cycle is in the heated condition and the state of cooling in turn.When residual gas leaves adsorption chamber by water saturation, and temperature from approximately-5 ℃ to+40 ℃ alter a great deal.Therefore, this part residual gas can not be used for making the water refrigeration effectively.
The shortcoming of said method is, limited the flow of the residual gas that can be used for making the water refrigeration to a great extent, thereby limited the reduction of water temperature.Therefore, must the jumbo refrigeration train of one cover be installed at the aqueduct that comes out from the refrigeration tower.
The objective of the invention is to improve the performance of refrigeration tower.For reaching this purpose, the invention provides a kind of method of airdistillation of the above-mentioned type, the regeneration that it is characterized in that adsorbent adopts such method to carry out: the medium regeneration temperature that residual gas is heated to substantial constant, specifically be included in the air themperature that enters adsorption chamber and be higher than between the temperature of about at the most 50 ℃ of the temperature that enters air (preferably about 10-20 ℃) the water refrigeration that the gas that utilizes at least a portion (all preferred) to carry out above-mentioned regenerative operation is used cooled compressed air.
This method can comprise one or several following feature:
-under the temperature of substantial constant, carry out the regeneration of adsorbent by single-stage with residual gas, after the single-stage regeneration, immediately this adsorbent is turned back to adsorbed state;
-by not passing through the compressed-air actuated heat transfer of described cooling as yet, the regeneration gas of remnants is heated to described moderate temperature;
-adopt from not carrying out described heat transfer indirectly as yet through the heat transfer liquids that absorbs heat the compressed air of described cooling;
-by heat exchange the regeneration gas of remnants is heated to described moderate temperature through the compressed air of repressurize with a part;
-re-using all the other cooling waters of compressed air being used from the residual gas of distilling apparatus freezes.
The present invention also has the airdistillation device that is suitable for implementing this method for realizing its purpose.This device comprises: a cover distilling apparatus; A main air compressor; With so that compressed air and cooling water carry out the first order heat exchanger of heat exchange; With so that the residual gas of the cooling water of described heat exchanger upstream and distilling apparatus carries out the water refrigeration tower of heat exchange; One cover removes the device of moisture and carbon dioxide, comprises at least two adsorbent chamber and makes adsorbent in the adsorption chamber be in the device in absorption phase and regeneration stage in turn; Supply with device to the adsorption chamber in regeneration stage from the residual gas of distilling apparatus; And the device that heats remaining regeneration gas, it is characterized in that this device that heats remaining regeneration gas is suitable for this gas is heated to the medium regeneration temperature of substantial constant, specifically be included in the air themperature that enters adsorption chamber and be higher than between the temperature of about at the most 50 ℃ of the temperature that enters air (preferably about 10-20 ℃), its feature is that also this device comprises the device that will send into the refrigeration tower from the remaining regeneration gas of the adsorption chamber that is in the regeneration stage.
Referring now to accompanying drawing embodiments of the invention are elaborated, wherein:
Figure 1 shows that the device schematic diagram that is used for airdistillation according to the present invention;
Figure 2 shows that a kind of schematic diagram of variant.
Device shown in Fig. 1 comprises: the main air compressor 1 on the discharge tube 2, and heat exchanger 3-5 that three interstations connect in succession has been installed in series on this pipeline; The adsorption chamber 6,7 of two wheel flow operations; One is set with the cooler bin 8 of main heat-exchange system 9 and device 10, is provided as the usefulness of airdistillation, and destilling tower can be to be exclusively used in two destilling towers of producing oxygen, or is used to produce the simple distillation tower of nitrogen; Pipeline 11 is used for being in the adsorption chamber 6 in regeneration stage and the adsorption chamber 7 of 7(illustrative embodiment with injecting from the hot junction of heat-exchange system 9 from the residual gas of distilling apparatus); The production pipeline 12 of drawing from the heat-exchange system hot junction; Be installed in the heat exchanger 13 on the pipeline 11 between cooler bin 11 and the adsorption chamber 6,7; The hot-water return 14 of circulating pump 15 is housed between heat exchanger 3 and 13; It for example is water/residual gas refrigeration tower 16 of filling tower; And the chilled(cooling) water return (CWR) 17 that circulating pump 18 is housed.For making graph reduction, only schematically show and can change adsorption chamber 6, the 7 alternately absorption and the device in regeneration stage, the heat exchanger 13 shown in the figure only is connected with an adsorption chamber 7 that is in the regeneration stage.
Now used numerical example is described in detail the operation of this device.
Processed atmospheric air is compressed to the middle pressure of 6 crust (absolute pressure) in 1, drop to 13.5 ℃ from about 100 ℃ through three grades of coolings then in 3,4,5.This air is introduced into the adsorption chamber 6 that is in absorption phase, leaves adsorption chamber under 18.5 ℃, and this is because due to the heat of adsorption of water and carbon dioxide.Cleaned air passes enters cooler bin 8, and after this place's cooling, method is routinely distilled.
Residual gas from device 10 leaves cooler bin by pipeline 11, and is divided into two strands of air-flows.
-main air is heated in 13 again+and 30 ℃, enter another adsorption chamber that carries out regenerative operation 7 then.This gas leaves adsorption chamber 7 under+6 ℃, send into the bottom of refrigeration tower 16 then by pipeline 19.
-remaining residual gas is directly delivered to the bottom of tower 16 by the pipeline 20 that valve 21 is housed.
Pump 15 can make water from heat exchanger 3(from this removal the compressed-air actuated heat from compressor 1) closed cycle is to heat exchanger 13, therein, water discharges its heat to residual gas and makes it be heated to described moderate temperature+30 ℃.
For example from the cooling water of phreatic+20 ℃, directly supply with heat exchanger 4 from appropriate sources 22, make compressed-air actuated temperature drop to+25 ℃.For making this air continue cooling, the water in identical source 22 can be delivered to the top of tower 16 by pipeline 23, therein, water is to dirty, contact with the residual gas of sending into the bottom of tower by pipeline 19 and 20 and to be cooled, residual gas then discharges from top of tower by pipeline 24.
Like this, water leaves tower 16 bottoms under+8.5 ℃, and sends into heat exchanger 5 by pump 18.
This just can make compressed-air actuated temperature before inlet chamber 6, be reduced to+13.5 ℃, cleaned air passes is left chamber 6 and is entered cooler bin 8 under 18.5 ℃.If wish that air themperature to be clean is lower, shown in the dotted line among the figure, the cooling group 25 of a cover low capacity can be installed on the water supply line of heat exchanger 5.
When chamber 6 when saturated, switch room 6 and 7.Purify the back from the chamber 7 air of discharging by fixed rules promptly be at the beginning+30 ℃ rather than 18.5 ℃.Therefore, one thermal current enters cooler bin, and still, the heating power deficiency of this thermal current is easy to be absorbed by the thermal inertia of heat-exchange system 9.
Because above-mentioned method, be used for temperature that the residual gas of reproducing adsorbent leaves chamber 6 or at 7 o'clock near constant and quite low (in listed examples, being+6 ℃), thereby can be as the cold-producing medium of tower 16.Therefore, all residual gas from distilling apparatus can be used for making the cooling water refrigeration of compressor, and like this, water can be cooled to low temperature.Directly advantage is the size that can reduce to be usually located at the refrigeration train in tower downstream, even it can be cancelled.
In addition, because regeneration temperature is lower, required heat can reclaim in the outlet of compressor, and the air themperature after the compression is about 100 ℃.
As a kind of variant, it is also contemplated that at the air that leaves compressor and leave between the residual gas of cooler bin and carry out indirect heat exchange, and the water loop 14 in the middle of not using.
Fig. 2 illustrates another kind of variant, in the case, before entering heat-exchange system 9 to the supercharging in 26 of major general part cleaned air passes, remaining regeneration gas can be in auxiliary heat exchanger 27 air by this gas and supercharging partly carry out heat exchange and heat.In the case, can cancel water loop 14, as shown in Figure 2.
The present invention also can be used for some devices, is included in to add to depress the airdistillation device that produces residual gas.In the case, water/nitrogen refrigeration tower can be closed, and can operation under pressurization.

Claims (10)

1, the method for airdistillation, in the method, air is compressed (in 1); Air after this compression carries out heat exchange be cooled (in 5) by carrying out freeze the in advance cooling water of (in 16) of heat exchange with residual gas from airdistillation device (10); This compression and cooled air purify moisture and the carbon dioxide of removing wherein (in 6) by adsorbent; Make adsorbent (in 7) regeneration by residual gas from the airdistillation device; It is characterized in that, this adsorbent adopts following method refrigeration, residual gas is heated to the medium regeneration temperature of substantial constant, specifically be included in the air themperature that enters adsorption chamber and be higher than about at the most 50 ℃ of the temperature that enters air, between preferred about 10-20 ℃ the temperature, utilize at least a portion, the cooling water refrigeration (in 16) that the preferred gas that had all carried out above-mentioned regenerative operation is used compressed air.
2, according to the method for claim 1, it is characterized in that: under the temperature of substantial constant, carry out the regeneration of adsorbent by single-stage, after the single-stage regeneration, immediately this adsorbent is turned back to adsorbed state with residual gas.
3, according to the method for claim 1 or 2, it is characterized in that: without overcooled compressed-air actuated heat transfer (in 14), the regeneration gas of remnants is heated to described moderate temperature by still.
4, according to the method for claim 3, it is characterized in that: take from not carrying out described heat transfer as yet through the mode (in 14) of the liquid indirect heat transfer of heat absorption (in 3) the compressed air of described cooling.
5, according to the method for claim 1 or 2, it is characterized in that: by heat exchange (in 27) regeneration gas of remnants is heated to described moderate temperature through the compressed air of repressurize (in 26) with a part.
6, according to each method among the claim 1-5, it is characterized in that: re-use the cooling water that all the other are used from residual gas cooling (in 16) compressed air of distilling apparatus.
7, the device of airdistillation, this device comprises: a cover airdistillation device (10); A main air compressor (1); With so that compressed air and cooling water carry out the main heat exchanger (5) of heat exchange; With so that the residual gas of the cooling water of described heat exchanger upstream and distilling apparatus carries out the water refrigeration tower (16) of heat exchange; One cover removes the device of moisture and carbon dioxide, and it comprises at least two adsorbent chamber (6,7) and makes adsorbent in the adsorption chamber be in the device in the absorption phase and the stage of regeneration in turn; Supply with device (11) to the adsorption chamber (6) in regeneration stage from the residual gas of distilling apparatus; And the device (13 that heats remaining regeneration gas; 27), it is characterized in that, this device that heats remaining regeneration gas is suitable for this gas is heated to the medium regeneration temperature of substantial constant, specifically be included in the air themperature that enters adsorption chamber and be higher than about at the most 50 ℃ of the temperature that enters air, between preferred about 10-20 ℃ the temperature, its feature is that also this device comprises the device (19) that will send into the tower (16) that freezes from the remaining regeneration gas of the adsorption chamber that is in the regeneration stage (7).
8, according to the device of claim 7, it is characterized in that: this device be included in residual gas enter be in the regeneration stage adsorption chamber (7) before, compressed-air actuated heat is passed to the device (3,13,14) of this residual gas, these devices comprise the second level heat exchanger (13) that is installed in the adsorption chamber import, are installed in the third level heat exchanger (3) between compressor (1) floss hole and the described first order heat exchanger (5), and the heat transfer liquids loop (14) between the described second level and the third level.
9, according to the device of claim 7, it is characterized in that: this device be included in residual gas enter be in the regeneration stage adsorption chamber (7) before, compressed-air actuated heat is passed to the device (3,13,14) of this residual gas, and these devices comprise and are installed in the adsorption chamber import, make residual gas and leave the second level heat exchanger that Air Compressor is carried out heat exchange.
10, according to the device of claim 7, it is characterized in that: this device comprises the repressurize device (26) that at least a portion cleaned air passes is used, with enter at residual gas be in the regeneration stage adsorption chamber (7) before, the device (27) that makes air after the supercharging and remaining regeneration gas carry out heat exchange.
CN94118725A 1993-11-19 1994-11-19 Process and installation for the distillation of air Pending CN1109964A (en)

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FR9313836A FR2712509B1 (en) 1993-11-19 1993-11-19 Process and installation for air distillation.
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JP (1) JPH07280432A (en)
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CA (1) CA2136132A1 (en)
DE (1) DE69415939T2 (en)
ES (1) ES2126724T3 (en)
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CA2136132A1 (en) 1995-05-20
JPH07280432A (en) 1995-10-27
DE69415939T2 (en) 1999-08-19
EP0654643B1 (en) 1999-01-13
ZA949066B (en) 1995-07-19
EP0654643A1 (en) 1995-05-24
AU7889494A (en) 1995-05-25
FR2712509B1 (en) 1995-12-22
ES2126724T3 (en) 1999-04-01
AU670010B2 (en) 1996-06-27
DE69415939D1 (en) 1999-02-25
FR2712509A1 (en) 1995-05-24

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